What is the CVSS score of CVE-2026-1363?

CVE-2026-1363 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-1363?

Within 24 hours: Identify all systems running IAQS and I6, isolate them from production networks if possible, and restrict access to trusted IP ranges only. Within 7 days: Contact JNC for a security patch timeline and interim guidance; implement a Web Application Firewall (WAF) with rules blocking manipulation of authentication parameters; audit recent access logs for suspicious activity. Within 30 days: Deploy the vendor patch immediately upon availability; conduct a full security audit of affected systems; reset administrator credentials and review all privileged account activities.

CVE-2026-1363

CRITICAL

Use of Client-Side Authentication (CWE-603)

2026-01-23 twcert@cert.org.tw

Information Disclosure

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send crafted HTTP request to web front-end
Exploit

Bypass client-side security enforcement
Execution

Manipulate authentication controls
Impact

Gain administrator privileges

Vulnerability Assessment

Weakness	CWE CWE-603 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V6 - Authentication Use of client-side authentication
Exploitation Conditions	No special conditions — remote unauthenticated exploitation against default web front-end configurations of JNC IAQS and I6 products. Client-side security enforcement is the vulnerable feature.
Impact	CVSS 9.8 — client-side security enforcement provides zero actual protection. Any attacker with a web proxy can bypass all access controls.
Exploit ScenarioDerived	An attacker uses a web proxy (like Burp Suite) to intercept and modify requests, bypassing client-side security checks to access restricted server functionality without authentication.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

IAQS and I6 systems by JNC have a client-side enforcement vulnerability allowing unauthenticated attackers to bypass security controls and access server functionality.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 9.8

Client-side security enforcement bypass in JNC IAQS/I6 enables unauthenticated access.

RemediationAI

Implement server-side authentication and authorization. Client-side checks should only supplement server-side enforcement.

Affected ProductsAI

JNC IAQS JNC I6

Affects your stack

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Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The IAQS and I6 systems rely on client-side enforcement of server-side security (CWE-603), meaning security checks are implemented in JavaScript or the client application and can be trivially bypassed.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

IAQS and I6 developed by JNC has a Client-Side Enforcement of Server-Side Security vulnerability, allowing unauthenticated remote attackers to gain administrator privileges by manipulating the web front-end.

Executive ViewAI

Why It Matters

A critical vulnerability in JNC's IAQS and I6 products allows unauthenticated attackers to gain administrative access by exploiting client-side security controls. This poses an immediate risk to any organization running these systems, potentially enabling complete system compromise and unauthorized access to sensitive data without any authentication requirement.

Business Impact: Severe

Compensating Controls

Implement Web Application Firewall (WAF) rules to enforce server-side validation and block requests attempting to modify authentication tokens or privilege levels; segment affected systems into a restricted network zone with strict ingress/egress controls; disable web front-end access and require VPN with multi-factor authentication for administrative functions; enable comprehensive logging and real-time alerting for any administrative privilege escalation attempts; consider temporarily disabling the affected IAQS and I6 functionality until a patch is available if business operations permit.

Threat Intelligence Overview

EPSS Score

0.0%

Top 85% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.